In episode 35, at around 6:00, little Nami writes "Cocoyashi" on the island's map. It also appears at around 14:00 written on a panel.
So that's the real name of the village, while "Cocoyasi" (appeared in a color walk) is just a writing mistake. If I remember in a contraddiction between anime and databook/color walk it's the first one who wins. --Meganoide (talk) 20:08, December 12, 2014 (UTC)